Author Question: A study examining the effects of white noise on concentration used two groups. The first group was ... (Read 85 times)

P68T · **on:** Jun 20, 2018

A study examining the effects of white noise on concentration used two groups. The first group
was exposed to 80 decibels of white noise for 30 minutes. The second group wore
noise-canceling headphones also for 30 minutes.

The group wearing the headphones is called
the
A) alternative group B) control group
C) experimental group D) null group

Question 2

Which of the following represents the null hypothesis for a two-group experiment?

A) M1 - M2 = 1 B) M1 M2
C) M1 - M2 = X1 - X2 D) M1 = M2